Improvement in the manufacture and coating of lead pipe



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FREDERICK BENNETT,-OF WATFORD, ENGLAND, ASSIGNOR TO JOHN S, GEORGE, OF NASSAU, NEW PROVIDENCE.

Letters Pateht'No. 60,851, dated January 1, 1867.

IMPROVEMENT IN THE MANUFAGTURE AND COATING 0P LEAD PIPE.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, FREDERICK BENNETT, of Watford, England, have invented new and useful improvements in the Manufacture and Tinning of Lead Pipes; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to fully understand and make use of the same.

This invention applies to lead pipes manufac ured by hydraulic pressure, and it consists of not only an improved process of manufacturing lead and composition pipes, but likewise of a new mode of tinning, silver tinning,'or coating lead pipes with other non-corrosive metal or composition.

In manufacturing lead and composition pipes, in place of the long mandrel or core which is commonly used, and which is forced with the ram of the pipe press by hydraulic pressure, and is thus continually moving whilst the pipe is being made, I use a, core or mandrel-box, which fits into the top of the container of the hydraulic pipe press. This core-box I make bevelled, adapting the bevel to a like bevel in the top of the container, so that it may'fit perfectly tight. The mandrel is short, and screws into the core-box, a fixture, and it is not movable whilst the lead pipe is beingimade. The core-box, and die which rests upon it, are secured firmly in place by a gland with screws, screw-bolts, or bolts with wedges.

In tinning, silver tinning, or coating my pipes with some white or non-corrosive metal or composition, I use the same stationary cores or mandrels, but in this case I make them hollow or tubular to the extent necessary, with openings and overflow orifices at such points as may be found best adapted for coating the interior of the pipe in the most even and perfect manner. The core-box and container are perforated in communication with such hollow mandrel to'connect with supply and discharge reservoirs on the outside of the container. To secure uninterrupted communication between the reservoir containing the coating metalor composition on the outside of the container and the overflow orifices of the hollow mandrel, I use metal tubes, one within the other, to slide into the core-box; and these metal tubes I make with bevel or screw ends, so that the same will fit tight and with screw-top to withdraw the surplus coating metal when necessary.

What I claim as new, and desire to secure by Letters Patent, .is' I 1. The within-described process of manufacturing lead pipe by the use of a stationary mandrel, in contradistinction to the mandrel generally used, which moves with the piston of the hydraulic ram, substantially as and for the perpose described.

2. The within-described process of coating the interior of lead pipes with tin or other suitable material, during theprocess of manufacturing the same by means of a hollow stationary mandrel, substantially as set forth.

The above specification of my invention signed by me this 11th day of May, 1866. 4

i F. BENNET'JY.

Witnesses:

J 01m Hsnmson, Notary Public, London. G. F WARREN, No. 17 Graeeckm eh Street, London. 

